Reinsurance - Summary of Effects of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Written premiums
Direct	$ 209.9	$ 188.6
Assumed	1.0	6.1
Gross	210.9	194.7
Ceded	(110.6)	(85.9)
Net	100.3	108.8
Earned premiums
Direct	221.2	202.5
Assumed	1.6	4.2
Gross	222.8	206.7
Ceded	(135.5)	(146.2)
Net	87.3	60.5
Loss and LAE incurred
Direct	211.0	117.3
Assumed	0.8	3.8
Gross	211.8	121.1
Ceded	(119.4)	(68.5)
Net	$ 92.4	$ 52.6

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Premiums Earned, Gross

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